Factored the generation of JSON serialization from beeing part of the mirror ...

test/mjsunit/mirror-array.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 29 matching lines @@
   assertTrue(mirror instanceof debug.ArrayMirror);
 
   // Check the mirror properties.
   assertTrue(mirror.isArray());
   assertEquals('object', mirror.type());
   assertFalse(mirror.isPrimitive());
   assertEquals('Array', mirror.className());
   assertTrue(mirror.constructorFunction() instanceof debug.ObjectMirror);
   assertTrue(mirror.protoObject() instanceof debug.Mirror);
   assertTrue(mirror.prototypeObject() instanceof debug.Mirror);
-  assertEquals(mirror.length(), a.length);
+  assertEquals(mirror.length(), a.length, "Length mismatch");
   
   var indexedValueMirrors = mirror.indexedPropertiesFromRange();
   assertEquals(indexedValueMirrors.length, a.length);
   for (var i = 0; i < indexedValueMirrors.length; i++) {
     assertTrue(indexedValueMirrors[i] instanceof debug.Mirror);
     if (a[i]) {
       assertTrue(indexedValueMirrors[i] instanceof debug.PropertyMirror);
     }
   }
 
   // Parse JSON representation and check.
   var fromJSON = eval('(' + json + ')');
   assertEquals('object', fromJSON.type);
   assertEquals('Array', fromJSON.className);
   assertEquals('function', fromJSON.constructorFunction.type);
   assertEquals('Array', fromJSON.constructorFunction.name);
-  assertEquals(a.length, fromJSON.length);
+  assertEquals(a.length, fromJSON.length, "Length mismatch in parsed JSON");
 
   // Check that the serialization contains all indexed properties.
   for (var i = 0; i < fromJSON.indexedProperties.length; i++) {
     var index = fromJSON.indexedProperties[i].name;
     assertEquals(indexedValueMirrors[index].name(), index);
     assertEquals(indexedValueMirrors[index].value().type(), fromJSON.indexedProperties[i].value.type, index);
   }
 
   // Check that the serialization contains all names properties.
   if (names) {
@@ skipping 22 matching lines @@
 a[100]=7;
 testArrayMirror(a);
 
 a=[1,2,3];
 a.x=2.2;
 a.y=function(){return null;}
 testArrayMirror(a, ['x','y']);
 
 var a = []; a.push(a);
 testArrayMirror(a);